Also known as: equal sovereignty · equal-sovereignty principle · equal footing doctrine
Written by attorneys · grounded in primary & secondary sources — see below
A constitutional principle that all states possess equal sovereignty within the federal system. The principle prohibits Congress from imposing differential regulatory burdens on some states but not others without extraordinary justification tied to current conditions.
Ella Emerson, a Texas voter, sues to block a federal statute that requires only states with large technology hubs, identified solely by 1990s internet data, to obtain Attorney General preclearance before altering online voter-registration rules. Pacific Logic intervenes to defend the statute. The court holds that the selective burden on Texas lacks the required contemporary justification and therefore violates equal sovereignty.
Eugene Ellsworth, a Georgia voter, and several other plaintiffs sue state officials after congressional districts are drawn with widely varying populations. The suit contends that the resulting dilution of votes in more populous districts denies the equal sovereignty of all states to have their citizens' votes counted on the same basis.
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Echelon Security, a Nevada company, refuses to pay a California tax assessment. California sues in Nevada state court. Nevada invokes the equal sovereignty principle to argue that one state may not hale another sovereign state into its courts without the same comity and immunity rules that would apply in reverse.
Congress must supply extraordinary justification based on current conditions showing that the targeted states present a distinctive problem. Reliance on decades-old data is insufficient.
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The principle is rooted in the Tenth Amendment and the constitutional structure of equal state sovereignty. It has been invoked in contexts beyond voting, including interstate relations and federal regulatory schemes that single out particular states.
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A facial challenge is ripe as soon as the statute imposes the unequal preclearance obligation. Plaintiffs need not wait for an actual denial of preclearance.
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The enforcement power is broad but not unlimited. Any departure from equal sovereignty must be congruent and proportional to current constitutional violations. Outdated formulas fail that test.
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…at 203–204. In today’s decision, the Court ratchets up what was pure dictum in Northwest Austin , attributing breadth to the equal sovereignty principle in flat contradiction of Katzenbach . The Court does so with nary an explanation of why it finds Katzenbach wrong, let alone any discussion of whether stare decisis nonetheless counsels…